Fluted safety joint apparatus for use in cased oil and gas wells
US4828291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Sep 28, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole oil well fluted safety joint for use with a production string in cased hole provides an elongated tubular body having an internal open-ended flow bore and a plurality of radially spaced apart flutes extending from the bottom of the tool bore outer surface. The flutes provide spaces therebetween that allow fluid to circulate in the casing externally of the tool body above and below the fluted portions so that gravel can be pumped past the flutes, for example, to pack a screen and liner which is run below the tool body in typical installations. The tool is used, for example, to guide wire line or wash pipe inside a screen liner in order to check for fill and to prevent the wire line or wash pipe from inadvertently traveling on the outside of the tool body and thus, beside instead of inside the screen liner. The tool body includes an uninterrupted, generally uniform outer cylindrical surface that extends upwardly from the fluted portions a distance above the fluted portions so that the tool body can be retrieved with a common releasing tool, for example, or with a standard overshot. Further, the extended uninterrupted outer surface of the tool body provides a surface that a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.